Production of ladderproof knitted fabric



March 10, 1936.

W. DOEHNER PRODUCTION OF LADDERPROOF KNITTED FABRIC Filed March 1, 1934 Patented Mar. 10, 1936 PRODUCTION OF LADDERPROOF KNITTED FABRIC William Doehner, Chemnitz, Germany, assignmto Lina Doehner, Chemnitz, Germany Application March 1 1934, Serial No. 713,591

In Germany March 2, 1933 7 Claims. (Cl. 66-96) It is known to work on machines having latch needles ladder-proof fabric in which the individual courses are held by a thread which is interlaced in the loops of the ground row in a manner resembling ordinary loops.

The present invention relates to such a method for machines having spring needles in which totally different functions are involved for the production of the courses of loops from those in the latch needle machines in which this is attained by means of needles which have two latches which are arranged one behind the other on the shaft of the needle. In the present invention the last row which has been knitted is taken up by auxiliary needles which can be constructed after the manner of ticklers and which also may have a long point with which they rest on the frame needles; thereupon a new course is sunk the loops of which are held by these auxiliary needles in such manner that the previous course of loops can be slipped over the new loops. In comparison with the latch needle machine the spring needle machine has the advantage that the fineness of goods pro-,

duced thereby has no upper limit, whereas on a latch "needle machine only goods up to a certain fineness can be produced. The new method is based, therefore, on the use of an auxiliary needle bar and the working in of a holding course in the ground fabric. In the accompanying drawing Figs. 1-.10 show the successive stages in the production of a course, while Fig. 11 shows the interlacing of the two threads, the retaining thread and the ground thread. i

A cotton machine is taken by way of example to illustrate the application of the new method.

The method can, however, be performed -withall other kinds of knitting machines having spring needles. Each loop of the knitted fabric b hangs on a needle a, Fig. 1, which can have a long pocket al. An auxiliary needle d, Fig. 2, which can be constructed in the form of a tickler engages between the knocking over sinkers c at the front and abuts against the corresponding needle (1 in such way that the point 411 of the auxiliary'needle d passes into the pocket al of the spring needle. On the advance of the sinkers f or other tools in combination with simul-.- taneous sinking of the needle ban-the fabric b which is already knitted is transferred to the auxiliary needles d, Fig. 3. The new thread e to be sunk passes outside the auxiliary needle or between the point of the auxiliary needle and the point of the frame needle. A loop e is now sunk from this thread, Fig. 4, If the loop is fabric itself, which is not novel, can be emsunk on the auxiliary needle the latter then makes such a motion that the loop slides off from it and lies between the point of the needle. and the point of the auxiliary needle, but if it is sunk directly on the frame needle then this 5 motion of the auxiliary needle is not necessary. However, if the auxiliary needle has been in contact with the frame needle it must move away therefrom, Fig. 5, and executes. motion such that its point dl moves over the loop e whereby this loop e passes under the point of the auxiliary needle and then can be held by the auxiliary needle, Fig. 6. The newly sunk row of loops is thus beneath the points of the auxiliary needles whereas the former course of 15 loops b is on the auxiliary needles. By a corresponding motion of the spring needle bar or of the knocking over sinkers c the latter cause the former course 1) hanging on the auxiliary needles to slip over the points thereof and thus go over the new loops e which are hanging beneath the points, so that the new course of loops has its sections which extend towards the sinkers passing through the preceding course (Figs. 7 and 8). The new row of loops e thereby constitutes a course of loops and is preferably held by the points di of the auxiliary needles. It is, however, immediately released as soon as the frame needle presser-bar 9 comes into operation and closes the points of the frame needles (Fig. 9). The preceding course 12 now hangs beneath these points and the new course is interlaced with the preceding course. This new course which in the meantime has been released from the auxiliary needles now slides over the pressed points and is carried on the former course b, Fig. 10. The operation then is repeated from the commencement.

In this way a fabric as shown in Fig. 11 is obtained in which a holdingcourse e is incorporated in the ground fabric, 1) so as to be interlaced with the individual loops; the holding course e prevents the separation and the running of damaged, broken or released loops. The

on the frame needles by the points of said auxiliary needles, placing said new loops by said auxiliary needles into the individual loops of said last completed course, placing'the loops of said last completed course under the beards of the frame needles while leaving the new loops outside said beards, pressing the beards and casting off the new loops onto the loops of said last completed course by slipping the new loops over the pressed points of said frame needles.

2. A method for producing ladderproof knitted fabrics on a machine with spring frame needles, comprising the steps of taking up the last completed course on auxiliary needles shaped after the manner of ticklers, sinking a new row of loops, catching the new loops which lie on the frame needles by the points of said auxiliary needles, placing said new loops by said auxiliary needles into the individual loops of said last completed course, placing the loops of said last completed course under the beards of the frame needles while leaving the new loops outside said .beards, pressing the beards, and casting off the new loops onto the loops of said last completed course by slipping the new loops over the pressed points of said frame needles.

3. A method for producing ladderproof knitted fabrics on a machine with spring frame needles, comprising the steps of taking up the last completed course on auxiliary needles shaped after the manner of ticklers terminating in curved points adapted to abut against the frame needles of said machine, sinking a new row of loops, catching the new loops which lie on the frame needles by the points of said auxiliary needles, placing said new loops by said auxiliary needles into the individual loops of said last completed course, placing the loops of said last completed course under the beards of the frame needles while leaving the new loops outside said beards, pressing the beards, and casting off the new loops onto the loops of said last completed course by slipping the new loops over the pressed points of said frame needles.

4. A method for producing ladderproof knitted fabrics on a machine with spring frame needles, comprising the steps of taking up the last completed course on auxiliary needles terminating in curved points adapted to abut against the frame needles of said machine, sinking a new row of loops, catching the new loops which lie on the frame needles by the points of said auxiliary needles, placing said new loops by said auxiliary needles into the individual loops of said last completed course, placing the loops of said last completed course under the beards of the frame needles while leaving the new loops outside said beards, pressing the beards, and

casting off the new loops onto the loops of said last completed course by slipping the new loops over the pressed points of said frame needles.

5. A method for producing ladderproof knitted fabrics on a machine with spring frame needles having particularly long pockets, comprising the steps of taking up the last completed course on auxiliary needles sinking a new row of loops, catching the new loops which lie on the frame needles by the points of said auxiliary needles, placing said new loops by said auxiliary needles into the individual loops of said last completed course, placing the loops of said last completed course under the beards of the frame needles while leaving the new loops outside said beards, pressing the beards, and casting off the new loops onto the loops of said last completed course by slipping the new loops over the pressed points of said frame needles.

6. A method for producing ladderproof knitted fabrics on a machine with spring frame needles having particularly long pockets, comprising the steps of taking up the last completed course on auxiliary needles terminating in curved points adapted to engage in said particularly long pockets of the frame needles, sinking a new row of loops, catching thenew loops which lie on the frame needles by the points of said auxiliary needles, placing said new loops by said auxiliary needles into the individual loops of said last completed course, placing the loops of said last completed course under the beards of the frame needles while leaving the new loops outside said beards, pressing the beards, and casting off the new loops onto the loops of said last completed course by slipping the new loops over the pressed points of said frame needles.

'7. A method for producing ladderproof knitted fabrics on a machine with spring frame needles having particularly long pockets, comprising the steps of taking up the last completed course on auxiliary needles shaped after the manner of ticklers and terminating in curved points adapted to engage in said particularly long pockets of the frame needles, sinking a new row 1 of loops, catching the new loops which lie on the frame needles by the points of said auxiliary needles, placing said new loops by said auxiliary needles into the individual loops of said last completed course, placing the loops of said last completed course under the beards of the frame needles while leaving the new loops outside said beards, pressing the beards, and casting off the new loops onto the loops of said last completed course by slipping the new loops over the pressed points of said frame needles.

WILLIAM DOEHNER. 

